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采用共沉淀法制备了CuO-ZnO-ZrO2催化剂,并研究其在低温脱除液相丙烯中微量CO的应用情况。通过XRD、BET、SEM等测试表明,CuO-ZnO-ZrO2催化剂中的ZrO2以无定形状态存在,可以显著增大比表面积和孔容积,促进CuO和ZnO的分散。在CO脱除应用中,还原预处理对于催化剂是必不可少的一步,并且还原温度显著影响催化剂的CO脱除性能。160℃还原活化的催化剂具有77.3%的还原度,在50℃、3.0 MPa的反应条件下,可将液相丙烯中体积分数1.0×10-5的CO脱除低至2×10-8,达到聚合级烯烃对CO脱除深度的要求,并且稳定性能良好。CO2杂质的引入降低了CuO-ZnO-ZrO2催化剂对CO的脱除深度,表明CO2气氛对CO的脱除起到一定的抑制作用。
The coprecipitation method was used to prepare CuO-ZnO-ZrO2 catalyst and its application in the removal of trace CO from liquid propylene at low temperature was studied. The results of XRD, BET and SEM indicate that ZrO2 in CuO-ZnO-ZrO2 catalyst exists in amorphous state, which can significantly increase the specific surface area and pore volume and promote the dispersion of CuO and ZnO. In CO removal applications, reduction pretreatment is an essential step for the catalyst, and the reduction temperature significantly affects the CO removal performance of the catalyst. The catalyst with reduction and activation at 160 ° C has a reduction degree of 77.3%. Under the reaction conditions of 50 ° C and 3.0 MPa, the CO in the liquid phase propylene with the volume fraction of 1.0 × 10 -5 can be removed as low as 2 × 10-8 to The polymerization grade olefins have a high CO removal requirement and good stability. The introduction of CO2 impurities reduced the CO removal depth of the CuO-ZnO-ZrO2 catalyst, indicating that the CO2 atmosphere has a certain inhibition effect on the CO removal.